At 16 kg, it lands on the rack like a declaration: this receiver wasn’t built just to play records.

Overview

The Kenwood KR-6170—also known as the "Jumbo Jet" or "The Entertainer"—isn't a conventional stereo receiver, even by early 1970s standards. Marketed as a solid-state FM/AM stereo receiver with a built-in "Rhythm Composer," it straddles the line between high-fidelity audio gear and home entertainment console. , the KR-6170 targeted amateur musicians and party hosts as much as audiophiles, packing dual microphone and guitar inputs, a spring reverb unit, and a footswitch-controlled rhythm generator capable of laying down drum patterns across twelve preset styles. At ¥145,000 upon release, it was a premium proposition, but its functionality justified the price for those seeking an all-in-one performance hub.

Its physical presence matches its ambitions: 551 mm wide, 172 mm tall, and 412 mm deep, the chassis houses serious engineering. The 16 kg mass hints at the heavy transformer and robust power supply needed to deliver up to 150W of IHF music power into 4 Ω loads. While continuous RMS output drops to 39W (4 Ω, both channels driven), this was still competitive for the era. The receiver supports speaker impedances from 4 Ω to 16 Ω, and includes pre/main output terminals for system expansion, plus three AC outlets—two switched, one unswitched—for powering external components.

What truly sets the KR-6170 apart is its onboard rhythm machine. The "Rhythm Composer" offers twelve selectable patterns—March, FoxTrot, Rock, R&B, Ballad, Shuffle, Bossanova (two variations), Latin Beat, Mambo, Waltz, and Jazz Waltz—with electronic percussion voices including cymbals, bass drum, snare, hi-hat, and conga. The rhythm mode can be set to Left, Right, Reverse, Stereo, or Mono, and tempo is continuously variable from Slow to Quick. A footswitch (included) allows start/stop control, making it viable for live vocal or instrumental accompaniment. Combined with the 0–2 second spring reverb and dual mic/guitar inputs, the setup enables impromptu karaoke or jam sessions long before those concepts entered the mainstream.

Despite its feature density, the KR-6170 maintains solid audio fundamentals. Frequency response on the Aux input stretches from 20 Hz to 40 kHz, and power bandwidth (IHF) spans 17 Hz to 30 kHz. Harmonic distortion is rated at 0.5% or less at full output, dropping to 0.1% at -3dB, while intermodulation distortion stays below 0.5%. The damping factor of 50 (8 Ω) suggests decent control over speakers, though not exceptional by modern standards. Tone controls offer ±10 dB adjustment at 100 Hz and 10 kHz, with a loudness compensation of +10 dB at 100 Hz and +5 dB at 10 kHz. A multi-presence selector provides preset EQ curves labeled Jazz, Vocal, and Mood, alongside standard Tone and Loudness modes.

Specifications

Key Features

Two Mic and Two Guitar Inputs with Mixer Function

The KR-6170 integrates a basic mixer stage with two dedicated microphone inputs (2.0mV/10k Ω) and two guitar inputs (15mV/30k Ω), allowing multiple performers to plug in directly. This wasn’t common on receivers of the era, which typically offered only line-level or phono inputs. The inclusion of both types suggests Kenwood envisioned this unit as a centerpiece for small home performances or vocal practice sessions, eliminating the need for a separate mixer.

Built-in Spring Reverb with 0–2 Second Control

A spring reverb unit with continuously variable depth (0 to 2 seconds) adds ambience to microphone and guitar signals. This analog effect, , gives vocals and instruments a lush, room-filling quality without external processing.

Footswitch-Controlled Rhythm Composer with 12 Presets

The heart of the KR-6170’s novelty is its "Rhythm Composer"—a fully integrated electronic drum machine with twelve preset styles. Activated via a footswitch (included), it generates patterns using synthesized percussion voices: cymbals, bass drum, snare, hi-hat, and conga. The rhythm can be routed to left, right, stereo, or mono, and tempo adjusted continuously. While not programmable, the variety of styles—from Rock and R&B to Jazz Waltz and Bossanova—makes it surprisingly versatile for backing tracks.

Multi-Presence Control with Jazz, Vocal, and Mood Settings

Beyond standard tone and loudness controls, the KR-6170 offers a "Multi-Presence" selector with dedicated EQ curves: Jazz, Vocal, and Mood. These presets tailor the sound signature for specific content— Combined with the reverb and rhythm, these settings create immersive listening or performance environments.

Collectibility & Value

The KR-6170 is considered rare, with collectors noting its uniqueness in Kenwood’s lineup. It appears infrequently on the secondhand market, though platforms like HiFiShark track availability across 400+ used audio sites. Recent sale prices have reached $450, with some listings asking $1,000 or best offer. Service manuals and schematics are commercially available, suggesting enough interest to support repair efforts. However, no data exists on common failures or maintenance challenges, leaving long-term reliability an open question.

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